Oh, wait. Strings. Um, yes, the Roto's are pretty bright, almost roundwound-ish. Fender 9050's are also pretty bright for flatwounds, as are D'Addario Chromes. It's a different sort of brightness than rounds, i.e., they don't sound like rounds, but they definitely have some upper mids and highs.

Yeah, maybe the Rotos are brighter but I hear they die after a week and the balancing leaves something to be desired. My Chromes are perfectly balanced and still going strong after more than a month of hard playing.